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## Summary - defer fresh-session `build_initial_context()` until the first real turn instead of seeding model-visible context during startup - rely on the existing `reference_context_item == None` turn-start path to inject full initial context on that first real turn (and again after baseline resets such as compaction) - add a regression test for `InitialHistory::New` and update affected deterministic tests / snapshots around developer-message layout, collaboration instructions, personality updates, and compact request shapes ## Notes - this PR does not add any special empty-thread `/compact` behavior - most of the snapshot churn is the direct result of moving the initial model-visible context from startup to the first real turn, so first-turn request layouts no longer contain a pre-user startup copy of permissions / environment / other developer-visible context - remote manual `/compact` with no prior user still skips the remote compact request; local first-turn `/compact` still issues a compact request, but that request now reflects the lack of startup-seeded context --------- Co-authored-by: Codex <noreply@openai.com>